+++ /dev/null
-
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-static const char *filename = NULL;
-static GLuint nr_steps = 4;
-static GLuint prim = GL_TRIANGLES;
-static GLfloat psz = 1.0;
-static GLboolean pointsmooth = 0;
-static GLboolean program_point_size = 0;
-
-static GLuint fragShader;
-static GLuint vertShader;
-static GLuint program;
-
-static void usage( char *name )
-{
- fprintf( stderr, "usage: %s [ options ] shader_filename\n", name );
- fprintf( stderr, "\n" );
- fprintf( stderr, "options:\n" );
- fprintf( stderr, " -f flat shaded\n" );
- fprintf( stderr, " -nNr subdivision steps\n" );
-}
-
-
-static void load_and_compile_shader(GLuint shader, const char *text)
-{
- GLint stat;
-
- glShaderSource(shader, 1, (const GLchar **) &text, NULL);
-
- glCompileShader(shader);
-
- glGetShaderiv(shader, GL_COMPILE_STATUS, &stat);
- if (!stat) {
- GLchar log[1000];
- GLsizei len;
- glGetShaderInfoLog(shader, 1000, &len, log);
- fprintf(stderr, "vp-tris: problem compiling shader:\n%s\n", log);
- exit(1);
- }
-}
-
-static void read_shader(GLuint shader, const char *filename)
-{
- const int max = 100*1000;
- int n;
- char *buffer = (char*) malloc(max);
- FILE *f = fopen(filename, "r");
- if (!f) {
- fprintf(stderr, "vp-tris: Unable to open shader file %s\n", filename);
- exit(1);
- }
-
- n = fread(buffer, 1, max, f);
- printf("vp-tris: read %d bytes from shader file %s\n", n, filename);
- if (n > 0) {
- buffer[n] = 0;
- load_and_compile_shader(shader, buffer);
- }
-
- fclose(f);
- free(buffer);
-}
-
-static void check_link(GLuint prog)
-{
- GLint stat;
- glGetProgramiv(prog, GL_LINK_STATUS, &stat);
- if (!stat) {
- GLchar log[1000];
- GLsizei len;
- glGetProgramInfoLog(prog, 1000, &len, log);
- fprintf(stderr, "Linker error:\n%s\n", log);
- }
-}
-
-static void setup_uniforms()
-{
- {
- GLint loc1f = glGetUniformLocationARB(program, "Offset1f");
- GLint loc2f = glGetUniformLocationARB(program, "Offset2f");
- GLint loc4f = glGetUniformLocationARB(program, "Offset4f");
- GLfloat vecKer[] =
- { 1.0, 0.0, 0.0, 1.0,
- 0.0, 1.0, 0.0, 1.0,
- 1.0, 0.0, 0.0, 1.0,
- 0.0, 0.0, 0.0, 1.0
- };
- if (loc1f >= 0)
- glUniform1fv(loc1f, 16, vecKer);
-
- if (loc2f >= 0)
- glUniform2fv(loc2f, 8, vecKer);
-
- if (loc4f >= 0)
- glUniform4fv(loc4f, 4, vecKer);
-
- }
-
- {
- GLint loc1f = glGetUniformLocationARB(program, "KernelValue1f");
- GLint loc2f = glGetUniformLocationARB(program, "KernelValue2f");
- GLint loc4f = glGetUniformLocationARB(program, "KernelValue4f");
- GLfloat vecKer[] =
- { 1.0, 0.0, 0.0, 0.25,
- 0.0, 1.0, 0.0, 0.25,
- 0.0, 0.0, 1.0, 0.25,
- 0.0, 0.0, 0.0, 0.25,
- 0.5, 0.0, 0.0, 0.35,
- 0.0, 0.5, 0.0, 0.35,
- 0.0, 0.0, 0.5, 0.35,
- 0.0, 0.0, 0.0, 0.35
- };
- if (loc1f >= 0)
- glUniform1fv(loc1f, 16, vecKer);
-
- if (loc2f >= 0)
- glUniform2fv(loc2f, 8, vecKer);
-
- if (loc4f >= 0)
- glUniform4fv(loc4f, 4, vecKer);
- }
-}
-
-static void prepare_shaders()
-{
- static const char *fragShaderText =
- "void main() {\n"
- " gl_FragColor = gl_Color;\n"
- "}\n";
- static const char *vertShaderText =
- "void main() {\n"
- " gl_FrontColor = gl_Color;\n"
- " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
- "}\n";
- fragShader = glCreateShader(GL_FRAGMENT_SHADER);
- load_and_compile_shader(fragShader, fragShaderText);
-
-
- vertShader = glCreateShader(GL_VERTEX_SHADER);
- if (filename)
- read_shader(vertShader, filename);
- else
- load_and_compile_shader(vertShader, vertShaderText);
-
- program = glCreateProgram();
- glAttachShader(program, fragShader);
- glAttachShader(program, vertShader);
- glLinkProgram(program);
- check_link(program);
- glUseProgram(program);
-
- setup_uniforms();
-}
-
-static void args(int argc, char *argv[])
-{
- GLint i;
-
- for (i = 1; i < argc; i++) {
- if (strncmp(argv[i], "-n", 2) == 0) {
- nr_steps = atoi((argv[i]) + 2);
- }
- else if (strcmp(argv[i], "-f") == 0) {
- glShadeModel(GL_FLAT);
- }
- else if (i == argc - 1) {
- filename = argv[i];
- }
- else {
- usage(argv[0]);
- exit(1);
- }
- }
-
- if (!filename) {
- usage(argv[0]);
- exit(1);
- }
-}
-
-
-
-
-union vert {
- struct {
- GLfloat color[3];
- GLfloat pos[3];
- } v;
- GLfloat f[6];
-};
-
-static void make_midpoint( union vert *out,
- const union vert *v0,
- const union vert *v1)
-{
- int i;
- for (i = 0; i < 6; i++)
- out->f[i] = v0->f[i] + .5 * (v1->f[i] - v0->f[i]);
-}
-
-static void subdiv( union vert *v0,
- union vert *v1,
- union vert *v2,
- GLuint depth )
-{
- if (depth == 0) {
- glColor3fv(v0->v.color);
- glVertex3fv(v0->v.pos);
- glColor3fv(v1->v.color);
- glVertex3fv(v1->v.pos);
- glColor3fv(v2->v.color);
- glVertex3fv(v2->v.pos);
- }
- else {
- union vert m[3];
-
- make_midpoint(&m[0], v0, v1);
- make_midpoint(&m[1], v1, v2);
- make_midpoint(&m[2], v2, v0);
-
- subdiv(&m[0], &m[2], v0, depth-1);
- subdiv(&m[1], &m[0], v1, depth-1);
- subdiv(&m[2], &m[1], v2, depth-1);
- subdiv(&m[0], &m[1], &m[2], depth-1);
- }
-}
-
-static void enable( GLenum value, GLboolean flag )
-{
- if (flag)
- glEnable(value);
- else
- glDisable(value);
-}
-
-/** Assignment */
-#define ASSIGN_3V( V, V0, V1, V2 ) \
-do { \
- V[0] = V0; \
- V[1] = V1; \
- V[2] = V2; \
-} while(0)
-
-static void Display( void )
-{
- glClearColor(0.3, 0.3, 0.3, 1);
- glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
- glPointSize(psz);
-
- glUseProgram(program);
- enable( GL_POINT_SMOOTH, pointsmooth );
- enable( GL_VERTEX_PROGRAM_POINT_SIZE_ARB, program_point_size );
-
- glBegin(prim);
-
-
- {
- union vert v[3];
-
- ASSIGN_3V(v[0].v.color, 0,0,1);
- ASSIGN_3V(v[0].v.pos, 0.9, -0.9, 0.0);
- ASSIGN_3V(v[1].v.color, 1,0,0);
- ASSIGN_3V(v[1].v.pos, 0.9, 0.9, 0.0);
- ASSIGN_3V(v[2].v.color, 0,1,0);
- ASSIGN_3V(v[2].v.pos, -0.9, 0, 0.0);
-
- subdiv(&v[0], &v[1], &v[2], nr_steps);
- }
-
- glEnd();
-
-
- glFlush();
-}
-
-
-static void Reshape( int width, int height )
-{
- glViewport( 0, 0, width, height );
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
- glMatrixMode( GL_MODELVIEW );
- glLoadIdentity();
- /*glTranslatef( 0.0, 0.0, -15.0 );*/
-}
-
-
-static void CleanUp(void)
-{
- glDeleteShader(fragShader);
- glDeleteShader(vertShader);
- glDeleteProgram(program);
-}
-
-static void Key( unsigned char key, int x, int y )
-{
- (void) x;
- (void) y;
- switch (key) {
- case 'p':
- prim = GL_POINTS;
- break;
- case 't':
- prim = GL_TRIANGLES;
- break;
- case 's':
- psz += .5;
- break;
- case 'S':
- if (psz > .5)
- psz -= .5;
- break;
- case 'm':
- pointsmooth = !pointsmooth;
- break;
- case 'z':
- program_point_size = !program_point_size;
- break;
- case '+':
- nr_steps++;
- break;
- case '-':
- if (nr_steps)
- nr_steps--;
- break;
- case ' ':
- psz = 1.0;
- prim = GL_TRIANGLES;
- nr_steps = 4;
- break;
- case 27:
- CleanUp();
- exit(0);
- break;
- }
- glutPostRedisplay();
-}
-
-int main( int argc, char *argv[] )
-{
- glutInit( &argc, argv );
- glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( 250, 250 );
- glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
- glutCreateWindow(argv[argc-1]);
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- args( argc, argv );
- prepare_shaders();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff